19607612509 has 4 divisors (see below), whose sum is σ = 19977567516. Its totient is φ = 19237657504.

The previous prime is 19607612503. The next prime is 19607612537. The reversal of 19607612509 is 90521670691.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13983062500 + 5624550009 = 118250^2 + 74997^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19607612509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19607612503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 184977424 + ... + 184977529.

It is an arithmetic number, because the mean of its divisors is an integer number (4994391879).

Almost surely, 2^19607612509 is an apocalyptic number.

It is an amenable number.

19607612509 is a deficient number, since it is larger than the sum of its proper divisors (369955007).

19607612509 is an equidigital number, since it uses as much as digits as its factorization.

19607612509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369955006.

The product of its (nonzero) digits is 204120, while the sum is 46.

The spelling of 19607612509 in words is "nineteen billion, six hundred seven million, six hundred twelve thousand, five hundred nine".